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One Direction's Niall Horan Has An Epic Celebrity Selfie Collection

High five, Niall!

One Direction's bright-eyed Irish crooner is sporting quite an impressive celebrity selfie collection online. Niall Horan has rubbed faces with everyone from Katy Perry to Will Ferrell.

For his latest selfie show-off, Horan posed cheek-to-cheek with fellow musician John Mayer. The "Who You Love" singer was finishing up a stop at London's O2 arena, only a day after One Direction finished their very memorable Wembley Stadium performances.

Take a stroll through the rest of Niall's celeb stockpile:

Olly Murs

Eddie Vedder

Soccer Star Lionel Messi

Will Ferrell

Paul Rudd

Spike Lee

Katy Perry

5 Seconds Of Summer's Luke Hemmings

5 Seconds Of Summer's Ashton Irwin

Rolling Stones' Ronnie Wood

Queen Elizabeth

Train's Pat Monahan

David Beckham

High five, Niall! Keep it coming with the rock legends.